_pad_h(h, up)
For example, suppose upRate is 3, and the input number of coefficients is 10, represented as h[0], ..., h[9].
Then the internal buffer will look like this:
h[9], h[6], h[3], h[0], // flipped phase 0 coefs 0, h[7], h[4], h[1], // flipped phase 1 coefs (zero-padded) 0, h[8], h[5], h[2], // flipped phase 2 coefs (zero-padded)
Store coefficients in a transposed, flipped arrangement.
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